I absolutely agree about additional rigor and precision making math easier to learn. Only after you're familiar with the concepts can you be more lazy. That's

I absolutely agree about additional rigor and precision making math easier to learn. Only after you're familiar with the concepts can you be more lazy. That's the approach taken by my favorite math book: https://people.math.harvard.edu/~shlomo/docs/Advanced_Calculus.pdf https://people.math.harvard.edu/~shlomo/docs/Advanced_Calcul...